Half to otis m



4 Patented Aug. 9, N898.

w. E. HANsoN. DENTAL PLUGGEB.

(Appnmion med omk 2s', 1897.1

(No Iodelj WINFIELD F. HANSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR OFOFF- HALF TO OTIS M. SHAW, OF SAME PLAOF.

DENTAL PLUeeERf SPECIFICATION forming part of Letters Patent No.608,984, dated August 9, 1898.

.Application led October 28, 1897. Serial No. 656,620. (No model.)

T0 a/ZZ w27/0m it may concern:

Be it known that I, WINFIELD E. HANSON, of Boston, in the county ofSuffolk and Commonwealth of Massachusetts, have invented certain new anduseful Improvements in Dental Implements. of which the following is adescription sufficiently full, clear, and exact to enable any personskilled in the art or science to which said invention appertains to makeand use the same, reference being had to the accompanying drawings,forming part of this specification, in which- Figurel is a sideelevationof my improved dental implement with the arms opened or intheir normal position; Fig. 2, 'a like View with the arms closed; Fig.3, a vertical transverse section taken on the dotted line 3 3 in Fig.

yl; Fig. 4, a side elevation showing a modification of my improvement,and Fig. 5 a detail showing the method of mounting the carrier on itsarm. I

Like letters of reference indicate corresponding parts in the differentfigures of the drawings. ,l

My invention relates .more especially to a dental implement designed foruse in filling teeth with amalgam or soft lling,7 much difficulty havingheretofore been experienced in properly and expeditiously performingwork of this character on` account of the nature of the fillingmaterials employed and a lack of suitable implementsfor that purpose.

My improvement overcomes these diiiiculties to a great extent byproviding a device whereby the amalgam or filling material may bereadily manipulated in either large or small quantities, forced into thecavity of the tooth, and also burnished or polished and finished whenthe cavity is filled.

The nature and operation of my improvement Willbe readily understood bythose conversant with Such matters from the following explanation In thedrawings, A B, respectively, represent two arms, which are arrangedSubstantially in parallelism with each other and secured atcorresponding ends to a block O after the manner ofordinary tweezers orspring-pincers; but the block may be omitted and the arms connecteddirectly to each other, if preferred.

Passing loosely through a hole or slot in the arm B there is a screw r,which is fitted to Work in a screw-threaded hole in the arm A and servesas a stop or gage to regulate the distance the arms may be opened orseparated; but any other device suitable for the same purpose may beemployed, if desired.

The outer or free ends of the arms A Bare correspondingly bent at aslight angle to the bodies of the arms, as respectively shown at tg, andrigidly secured to the part t of the arm A there is a plugger el,provided .at its outer end with a burnisher f, the body ofsaid plu ggerstanding at right angles tothe part t, but being inclined at an obtuseangle to the body'ofits arm A. The part g of the arm B is slottedlongitudinally to form a fork or Way, (see Fig.` 5,-) in which a carrier72, for containing the filling material is disposed, saidI carrier beingin the form of a hollow cylinder or a tube open at both of its ends. Theplugger cl is tted and arranged to work longitudinally therein somewhatafter the manner of a piston.

Grooves m are formed in the sides of the carrier 7L near its inner end,in which the tines or prongs 7.o of the fork on the arm B are insei-ted.

The slot between the tines 7c is of such length as to permit the carrierto slide back and forth therein longitudinally of the part t, and thegrooves m are of such size as to permit said carrier to Swing or vibratesufhcientl y to compensate for the movements of the plugger as saidplugger passes through the arc of the circle which it describes inopening and closing the arms A B.

The outer end of the carrier 7L is reduced or rabbeted exteriorly toform the shoulder i,

and also to enable the carrier to beinserted more readily in thel cavityof the tooth and canted or inclined therein, the shoulder bearingagainstthe end of the toothand serving as a rest or fulcrum for thecarrier, thereby enablingthe implement to be manipulated to betteradvantage in filling the cavity.

The plugger d is longer than Mthe carrier 71, and provided near theburnisher-head'fwith an annular groove oto permit-the -plugger to becanted or inclined more readily when fully pushed through the carrierand used strictly as a plugger or burnisher.

In the'use of my improvement after, the

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operator has excavated and properly dried and prepared the cavity in thetooth, the arms A B being in the position shown in Fig. l, the carrier7L is pushed into the mass of plastic amalgam or iilling material,thereby forcing a quantity of the same through the mouth x into thecarrier under the plugger d.

The operator now inserts the implement in the mouth of the patient,placing the outer end of the carrier in the cavity of the tooth, withthe shouldert' resting on the end thereof. The arms A B are thencompressed or closed, thereby causing the plugger d to force the amalgamor filling from the carrier and cause it to be ejected into the cavity,the operation being repeated until the cavity is iilled, after which thefilling may be nished with the burnisher-headf without removing theimplement from the mouth of the patient.

By the use of my improved implement as described the danger of eitherthe cavity or filling becoming unduly moistened with saliva during theoperation is reduced to a minimum, as the work may be accomplished withmuch greater rapidity and more effectively than when the iilling isinserted in the ordinary way.

`In the construction shown in Fig. l the arm B is reduced near its shankto form the spring integral with said arm; but both of the arms A B maybe thus reduced, as in Fig. 4, if desired, although I deem it preferableto have the carrier-arm only so reduced. The arms may also be pivotallyconnected and an independent spring employed to open or separate them,or the spring may be entirely omitted when the arms are so pivotedwithout departing from the spirit of my invention.

The plugger CZ and carrier h are respectively inclined at an obtuseangle to the bodies of the arms A B to enable the implement to be usedwith greater ease and facility in filling cavities in the teeth, moreespecially in the molars or rear teeth; but the plugger and carriermaybe arranged at any other suitable angle to the bodies of the arms A B,if

' desired or found to be necessary, in order to perform special work.

I do not coniine myself to the employment of a carrier h for the amalgamor filling which is round in cross-section, as it may be made square,octagonal, or of any other suitable form, the plugger of course beingmade to correspond, if necessary; nor to the use of the fork as a wayfor said carrier, as the carrier may be mounted in any suitable wayadapted to permit it to traverse longitudinally of its arm, asdescribed; nor to rigidly securing the plugger CZ on its arm, as theplugger may be arranged to traverse and the carrier rigidly secured,although itis preferable to have the carrier traverse and the pluggerrigidly secured to its arm, as the plugger is then better adapted toserve as a burnisher. As the plugger passes through a very short arc ofa circle, it will be obvious that the reciprocating movements of thecarrier'are but slight, even when the plugger is fitted to work closelytherein, and that when the plugger is of such size as to work loosely inthe carrier the means for producing vibratory movements of the carriermay be dispensed with. I deem it, however, preferable to have theplugger work closely in the carrier in order to eject the fillingmaterial properly, especially when small quantities are used at a time.Neither do I confine myself to providing the arms with the inclinedportions tg, as the plugger and carrier may be arranged and secured atan angle to their respective arms without the use of said portions.Means may also be readily provided for adjusting both the plugger andcarrier at any angle on their respective arms and have them performtheir functions properly.

Having thus described my invention, what I claim isl. A dental toolcomprising two arms movable in relation to each other; a way formed onthe free end of one of said arms; a hollow carrier mounted to move onsaid way, and a plugger on the companion arm fitted to work in saidcarrier.

2. A dental tool comprising two spring-separated arms; a carrier on oneof said arms; and a plugger on the companion arm, said plugger beinggrooved adjacent its free end to forma head, and fitted to work in saidcar- 3. In a dental tool the combination of two spring-separated arms; acarrier for the lilling; a way on the free end of one of said arms onwhich said carrier is fitted to traverse and vibrate; a plugger rigid onthe companion arm, and fitted to work in said carrier, said pluggerhaving a head adapted to be projected beyond the mouth of the carrierwhen said arms are compressed, and a stop limiting the spring-actuatedmovement of said arms substantially as described.

4t. In a dental tool the spring-separated arms, A, B, providedrespectively with the offset portions, t, g, at their free ends incombination with a hollow carrier fitted to move laterally onthe offsetportion of one arm, and a plugger mounted on the offset portion of thecompanion arm and fitted to work in said carrier substantially asdescribed.

5. In a dental tool the springtensioned arms, A, B, providedrespectively with the offset portions, t, g, the portion, g, beingslotted to form a Way, in combination with the cylindrical carrier, h,mounted to slide in the arms of said Way; the plugger, CZ, rigidlymounted on the offset, t, and fitted to Work in and project from saidcarrier; and the adjustable stop, fr, limiting the movement of said armsin one direction all being arranged to operate substantially asspecified.

WINFIELD E. HANSON.

Witnesses:

C. A. SHAW, A. J. ORAMER.

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